<!DOCTYPE html>
<html>

<head>
  <title>欢迎来到图书管理系统</title>

</head>
<style>
  body {
    display: flex;
    justify-content: center;
    width: 100%;
    height: 100vh;
    background: url("https://tse1-mm.cn.bing.net/th/id/OIP-C.tTegtCtqWqraPaz2ZpJACAHaEK?w=306&h=180&c=7&r=0&o=5&dpr=1.5&pid=1.7");
    background-position: center;
    background-size: cover;
  }

  p {
    font-size: 50px;
    color: azure;
  }

  a {
    margin-top: 150px;
    margin-left: -300px;
    font-size: 40px;
    font-weight: 600;
  }
</style>

<body>
  <p>Welcome to 图书管理系统</p>
  <a href="/login">登录</a>
</body>
</html>